First of all, I work for ALMA and I'm part of the workers union , but i'm speaking for myself.
the budget is 1.5 billion already spent on the project , each antenna with all its equipment cost US$10 million, and there are 64 of them,and then you have to add all the building, devices, software licenses, computers, network equipment and other things that the project needs, so you can go easily to one billion only on that , which is already in place.
about two, yes english site, agree use , instead of . for thousand separator ;)
three, 2,000 USD is the average, some workers make less than 1,000 USD per month, working 12 hours a day on 8 days working, 6 days off shift, the average is 2,000 USD and top paid workers are getting nearly 6,000 USD per month.
Another important point, we are on strike NOT for the money, we are on strike because the company that have our contracts is changing condition and removing some benefits , maybe U.S. laws permit that, but ALMA is located in Chile, and laws here are different, also ALMA is abusing of its special diplomatic condition to disallow inspection by the agency in charge of verify working conditions (Inspeccion del Trabajo de Chile).
Also to clarify, most of the work is performed at 5,000msn (16,000 ft over sea level), with tempetures as low as -10 celcius (14 fahrenheit) with relative humidity of 5% and winds of 10 m/s (32feet/s).